Bar cold heading feeding mechanism

Abstract

The utility model discloses a bar cold heading feeding mechanism which is characterized in that after a material head of a bar penetrates through a supporting piece to abut against a material blocking rod, when a PLC (Programmable Logic Controller) calculates and controls a shearing assembly to carry out cut material removal and material tail shearing, the PLC can adjust the position of the material blocking rod by calculating the length of the material tail, and the material blocking rod can carry out cold heading on the bar. By means of the technical effects that the positions of the material heads / the material tails can be automatically detected, the feeding precision can be dynamically adjusted, seamless connection of blanks is achieved, and the rejection rate is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of metal plastic forming equipment, in particular to a bar feeding mechanism for a cold heading machine, specifically a feeding device capable of automatically cutting off head / tail defects and achieving seamless connection of blanks. Background Art

[0002] In cold heading, the head and tail of the material that have not been cut by the cutter often have defects such as irregular shape, bruises, corrosion or burrs, which make it unable to meet the quality requirements of high-precision blanks. In particular, the tail of the material is prone to produce scrap due to length error.

[0003] In addition, there are manufacturing errors in the length of the bars in actual production, and the fluctuations in the length of the tail caused by different shearing lengths further increase the difficulty of automated cutting. The existing feeding mechanism lacks dynamic adjustment capabilities and is difficult to adapt to real-time changes in the length of the head / tail of the material. A high-precision, adaptive solution is urgently needed. Utility Model Content

[0004] In view of the problems of inaccurate cutting of the head / tail of the material and low material utilization rate in the prior art, the utility model provides a cold heading feeding mechanism which can automatically detect the position of the head / tail of the material and dynamically adjust the feeding accuracy, so as to achieve seamless connection of the blanks and reduce the scrap rate.

[0005] To achieve the above purpose, the utility model provides the following technical solution: a bar cold heading feeding mechanism, comprising:

[0006] A bar feeder (1) for feeding bar materials;

[0007] A cutting table (2) is arranged at the output end of the bar feeder (1), and is provided with a shearing assembly (3), a material blocking rod (4), and a sleeve-shaped support member (5), wherein the material blocking rod (4), the support member (5) and the feeding path of the bar feeder (1) are arranged in a straight line, and the shearing assembly (3) is arranged between the material blocking rod (4) and the support member (5);

[0008] A servo motor (6) is drivingly connected to the material blocking rod (4) to control its telescopic movement;

[0009] A V-groove feeding wheel assembly (7) is arranged in front of the input end of the cutting table (2) and is driven by a feeding motor (8);

[0010] An encoder (9) is mounted on the axle of the V-groove feeding wheel assembly (7) and is used to detect the rotation angle of the feeding wheel to calculate the feeding length;

[0011] A position sensor (10) is arranged at the input end of the cutting table (2) and is used to detect the positions of the head and tail of the bar;

[0012] A PLC controller (11), which is signal - connected to a servo motor (6), an encoder (9), a position sensor (10) and a shearing assembly (3);

[0013] The shearing assembly (3) includes an upper cutter and a lower cutter. The upper cutter driven by a cylinder can stretch. The cylinder is connected to an air pump through a solenoid valve (161), and the PLC controller (11) controls the opening and closing of the solenoid valve (161);

[0014] A pressure sensor (14) is arranged on the material blocking rod (4), which includes a pressure - sensitive element and a signal - processing unit, and is used for detecting the contact pressure of the bar stock and feeding it back to the PLC controller (11);

[0015] A counter (15), which is connected to the PLC controller (11) and is used for calculating the required shearing times of the bar stock;

[0016] The PLC controller (11) calculates the length of the bar stock in real - time through the encoder (9) and monitors the conveying speed of the bar stock, and dynamically adjusts the stretching distance of the material blocking rod (4) according to the value of the counter (15) to remove the head and tail of the material and achieve seamless connection of the blank;

[0017] A rotating shaft is arranged on the cutting table (2). The output shaft of the servo motor (6) is connected to the rotating shaft. A turbine is connected to the end of the rotating shaft. A worm meshing with the turbine for transmission is also installed in the cutting table. The cutting table is provided with a sliding seat moving linearly in a guiding manner, and the sliding seat is in threaded transmission connection with a screw rod. The material blocking rod (4) is installed on the sliding seat.

[0018] The PLC controller (11) has a built - in algorithm. The calculation formula for the total length L of the bar stock is L = standard material length L1×counter value n+tail - stock position length L0, where L0 is the fixed distance from the position sensor (10) to the shearing point.

[0019] When the length of the tail stock W = L0 - L1×(S - n) is less than 1 / 2L1, the PLC controller (11) controls the servo motor (6) to make the material blocking rod (4) retract by a distance of 1 / 2L1 and triggers the tail - stock shearing action in advance.

[0020] The counter (15) is automatically cleared when the second bar stock is sheared, and starts counting again to cycle - remove the head and tail of the material. Then the material blocking rod returns to its original position, so that the shearing of the material blocking rod and the shearing assembly maintains a standard material - length size.

[0021] The beneficial effects of the present utility model are as follows: After the material head of the bar stock passes through the support member and abuts against the stop bar, the PLC controller calculates and controls the shearing assembly to cut and remove the material. When cutting the material tail, the PLC controller can adjust the position of the stop bar by calculating the length of the material tail, so that the material tail of the bar stock completely enters between the shearing assembly and the stop block before cutting and removing the material, achieving the technical effect of automatically detecting the positions of the material head / material tail and dynamically adjusting the feeding accuracy, realizing seamless connection of the blank and reducing the rejection rate.

[0022] The following further describes the present utility model in conjunction with the accompanying drawings and specific embodiments. Description of the Drawings

[0023] Figure 1 It is the overall structure diagram of the specific embodiment of the present utility model;

[0024] Figure 2 It is the installation structure diagram of the stop bar in the specific embodiment of the present utility model;

[0025] Figure 3 It is the logic block diagram of the PLC control system in the specific embodiment of the present utility model.

[0026] In the figure, 1 is a bar feeder; 2 is a cutting table; 3 is a shearing assembly; 4 is a stop bar; 5 is a support member (in the shape of a sleeve); 6 is a servo motor (controlling the telescopic movement of the stop bar); 7 is a V-groove feeding wheel set; 8 is a feeding motor (driving the feeding wheel); 9 is an encoder (detecting the rotation angle of the feeding wheel); 10 is a position sensor (detecting the position of the material head); 11 is a PLC controller (main control unit); 14 is a pressure sensor (integrated on the stop bar); 15 is a counter (counting the shearing times); 16 is a cylinder (driving the upper cutter); 21 is a rotating shaft (connected to the output shaft of the servo motor) 22 is a turbine (cooperating with the worm for transmission); 23 is a worm (driving the slide to move); 24 is a slide (linear guiding and moving component); 161 is a solenoid valve (controlling the action of the cylinder). Specific Embodiments

[0027] The following specifically describes the present utility model through embodiments, which are only used for further illustration of the present utility model and cannot be construed as limiting the protection scope of the present utility model.

[0028] Such as Figures 1-3As shown in the figure, this embodiment discloses a bar cold heading feeding mechanism, which includes a bar feeder 1 and a cutting table 2. A shearing assembly 3 is installed on the cutting table 2, which consists of a stop rod 4 and a sleeve-shaped support member 5. The feeding paths of the stop rod 4, the support member 5 and the bar feeder 1 are linear. The shearing assembly 3 is arranged between the support member and the stop rod 4. The servo motor 6 controls the telescopic movement of the stop rod 4. The bar passes through the support member 5 through the conveying of the feeding wheels. The feeding wheels are driven by a feeding motor 8. It also includes an encoder 9, a PLC controller 11, and a position sensor 10. The position sensor 10 is arranged at a position close to the input end of the cutting table 2. In front of the input end of the cutting table 2, there is a V-groove feeding wheel group 7. The feeding wheels of the V-groove feeding wheel group 7 are driven by a feeding motor 8. An encoder 9 for detecting the rotation angle of the feeding wheel within any feeding length is installed on the axle of the feeding wheel.

[0029] Among them, specifically as Figure 2 shown, a rotating shaft 21 is arranged on the cutting table 2. The output shaft of the servo motor 6 is connected to the rotating shaft 21. A turbine 22 is connected to the end of the rotating shaft 21. A worm 23 that is in meshing transmission with the turbine 22 is also installed inside the cutting table 2. The cutting table 2 is provided with a sliding seat 24 that moves linearly and guides. The sliding seat 24 is in threaded transmission connection with a screw rod. The stop rod 4 is installed on the sliding seat 24. In this way, it can ensure that the servo motor 6 accurately controls the telescopic movement of the stop rod 4 and adjusts the position according to the required length of the cut material.

[0030] The shearing assembly 3 adopts an upper cutting knife and a lower cutting knife. The lower cutting knife is fixedly arranged, and the upper cutting knife is driven by a cylinder 16, so as to cut off the defective parts of the material head and the material tail. The upper cutting knife is equipped with a counter 15. When the first material rod passes through the feeding wheel set 7, the position sensor 10 detects the material head, and the encoder 9 below the position sensor 10 starts to monitor the speed of the first material rod in real time. A pressure sensor 14 is arranged on the material blocking rod 4. The pressure sensor 14 includes a pressure sensitive element and a signal processing unit. The pressure sensitive element transmits the pressure to the PLC controller 11 in the form of a signal. When the material head of the first material rod contacts the material blocking rod 4, the PLC controller 11 controls the shearing assembly 3 to perform shearing, and the counter 15 on the shearing assembly 3 starts to count. The count 1 of the counter 15 in the PLC controller 11 is set for the material head removal process. At the same time, the PLC controller 11 starts to calculate the length of the first material rod. The calculation method of the first material rod length is L = standard material length L1 * count n of the counter 15 + length L0 of the detected material tail position. L0 is the position distance from the position of the position sensor 10 to the shearing point of the knife, and this distance parameter is fixed. At this time, the PLC controller 11 calculates the total shearing quantity S, and sets that when the counter 15 approaches S through program control, it is ready to cut the tail material of the first material rod, and at the same time calculates the tail material length. The tail material length is W = L0 - L1 * (S - N). When the tail material length W < 1 / 2L1, there may be a state of damaging the shearing knife. At this time, the count point of S - 1 is set as the final material tail removal. The material tail removal method is to control the servo motor 6 through the PLC controller 11 to make the material blocking rod 4 retract a distance of 1 / 2L1, and at the same time control the feeding motor to control the feeding wheel to output a distance of 1 / 2L1 of the first material rod. At this time, the material head of the first material rod contacts the material blocking rod 4, and the material head of the second material rod will contact the material tail of the first material rod. The count point S - 1 makes the final material tail shearing, and at the same time cuts off the material head of the second material rod. In this way, the final tail material with a length of W < 1 / 2L1 can be sheared off together with the head of the second material rod, improving the shearing and removal efficiency. At this time, the counter 15 is cleared, and the counter starts to count again. Although the first material head shearing of the second material rod is used as the material tail shearing of the second material rod, in the program, the material head of the second material rod has not started to be sheared yet, mainly considering that the material head defect of the second material rod has not been completely removed, so the material head shearing starts again.

[0031] In reality, the defective positions of the material head / tail are not the same, and the length distances are not unified. The corresponding parameters can be changed according to the situation. Next, the second material rod can repeat the program operation of the first material rod.

[0032] When the tail material length W > 1 / 2L1, the count point of S is set as the final material tail removal.

[0033] The PLC controller 11 controls the servo motor 6 and the shearing assembly 3. The structure of the shearing assembly 3 adopts upper and lower cutting blades. The upper cutting blade is driven by a cylinder 16, and the cylinder 16 is connected to an air pump through a solenoid valve 161. The PLC controller 11 controls the solenoid valve 161 to make the upper and lower cutting blades perform a shearing action. The PLC controller 11 detects the conveying speed of the bar stock through an encoder 9, so that the head and tail of the bar stock can be effectively removed automatically.

[0034] After adopting the above technical solution, after the head of the bar stock passes through the support member and abuts against the stop rod 4, the PLC controller 11 calculates and controls the shearing assembly 3 to cut and remove the material. When cutting the tail of the material, the PLC controller 11 can calculate the length of the tail of the material and adjust the position of the stop rod 4, so that the tail of the bar stock completely enters between the shearing assembly 3 and the stop block before cutting and removing the material, achieving the technical effect of being able to automatically detect the position of the head / tail of the material and dynamically adjust the feeding accuracy, realizing seamless connection of the blank and reducing the rejection rate.

[0035] The above shows and describes the basic principles, main features and advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic features of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0036] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A bar cold heading feeding mechanism, characterized in that: A bar feeder (1) for feeding bar materials; A cutting table (2) is arranged at the output end of the bar feeder (1), and is provided with a shearing assembly (3), a material blocking rod (4), and a sleeve-shaped support member (5), wherein the material blocking rod (4), the support member (5) and the feeding path of the bar feeder (1) are arranged in a straight line, and the shearing assembly (3) is arranged between the material blocking rod (4) and the support member (5); A servo motor (6) is drivingly connected to the material blocking rod (4) to control its telescopic movement; A V-groove feeding wheel assembly (7) is arranged in front of the input end of the cutting table (2) and is driven by a feeding motor (8); An encoder (9) is mounted on the axle of the V-groove feeding wheel assembly (7) and is used to detect the rotation angle of the feeding wheel to calculate the feeding length; A position sensor (10) is arranged at the input end of the cutting table (2) and is used to detect the positions of the head and tail of the bar; A PLC controller (11) is signal-connected to the servo motor (6), the encoder (9), the position sensor (10) and the shearing component (3); The material blocking rod (4) is provided with a pressure sensor (14), comprising a pressure sensitive element and a signal processing unit, for detecting the contact pressure of the bar material and feeding back the pressure to the PLC controller (11); A counter (15) connected to the PLC controller (11) for calculating the number of shearing times required for the bar material; The PLC controller (11) calculates the length of the bar material and monitors the bar material conveying speed in real time through the encoder (9), and dynamically adjusts the telescopic distance of the material blocking rod (4) according to the value of the counter (15) to remove the head and tail of the material and achieve seamless connection of the blanks.

2. The cold heading feeding mechanism according to claim 1, characterized in that: The cutting table (2) is provided with a rotating shaft, the output shaft of the servo motor (6) is connected to the rotating shaft, the end of the rotating shaft is connected to a turbine, a worm gear is also installed in the cutting table and is driven in cooperation with the turbine, the cutting table is provided with a slide seat for linearly guided movement, the slide seat is threadedly connected to the screw, and the blocking rod (4) is installed on the slide seat.

3. The cold heading feeding mechanism according to claim 1, wherein: The PLC controller (11) has a built-in algorithm, and the total length L of the bar material is calculated as L=standard material length L1×counter value n+material tail position length L0, where L0 is a fixed distance from the position sensor (10) to the shearing point.

4. The cold heading feeding mechanism according to claim 3, characterized in that: When the tail length W = L0-L1×(Sn) is less than 1 / 2L1, the PLC controller (11) controls the servo motor (6) to make the material blocking rod (4) retreat a distance of 1 / 2L1 and trigger the tail shearing action in advance.

5. The cold heading feeding mechanism according to claim 1, characterized in that: The counter (15) is automatically reset when the second bar is cut, and restarts counting to cyclically remove the beginning and end of the bar.

6. The cold heading feeding mechanism according to claim 1, wherein: The shearing assembly (3) comprises an upper cutter and a lower cutter. The upper cutter is extended and retracted by a cylinder. The cylinder is connected to an air pump via a solenoid valve (161). The PLC controller (11) controls the opening and closing of the solenoid valve (161).

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